task4 ( ds lab 5) 3rd sem

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n, k, operations=0;
    cout<<"Enter value of k & n"<<endl;
    cin >> n >> k;
    cout<<"Enter values"<<endl;
    priority_queue<int, vector<int>, greater<int> > pq;
    for (int i=0; i<n; i++)
    {
        int a;
        cin>>a;
        pq.push(a);
    }
    while (pq.top()<k && pq.size()>=2)
    {
        int cookie1=pq.top();
        pq.pop();
        int cookie2=pq.top();
        pq.pop();
        pq.push(cookie1+2*cookie2);
        operations++;
    }
    if(pq.top()>=k)
        cout<<operations;
    else
        cout<<"-1";
}